As was discussed already earlier: AirDrop have transformed through the time and started to more follow an interests of both parties: participants and company launching airdrop. The main difference between bounty campaign and airdrop is duration (in case of airdrop - limited by amount of participants or period of time) and level of difficulty (in case of airdrop - simple actions, which should be done just once). But this is our evaluation and maybe it is not going according to Your opinion, this is totally fine, we all have own visions. We believe in changes, we believe that blockchain technology is moving fast and as well everything connected to this field and it is unnecessary to get sucked with classical, so to speak, old ways. But this is purely only our opinion.